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Full Discussion: Value validation
Top Forums Shell Programming and Scripting Value validation Post 302884087 by rbatte1 on Friday 17th of January 2014 11:18:24 AM
Old 01-17-2014
Assuming that this is processing a file, then there is a high cost to calculating the length this way. Have you considered:-
Code:
length="${#temp}"

You should also consider a case statement to branch to appropriate code as if...then...else....if....fi....fi can be confusing to read through. If you only have three options, it would be neater as a start to have something like:-
Code:
for val in a b c a b a
do
   if [ $val = a ]
   then
      echo val=a
   elif [ $val = b ]
   then
      echo val=b
   else
      echo other
   fi
done

Overall it would be better to write it as:
Code:
for val in a b c a b a
do
   case "$val" in
      a) echo val=a ;;
      b) echo val=b ;;
      *) echo other ;;
   esac
done

Can you adapt this to fit your input and generate your output? You might need to slice up your variable and work on the first character, so if you are holding the the value val then the first character is "${val%${val#?}"

Does this help?




Robin
Liverpool/Blackburn
UK
 

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LEARN ABOUT DEBIAN

amdtemp

AMDTEMP(4)						   BSD Kernel Interfaces Manual 						AMDTEMP(4)

NAME

     amdtemp -- device driver for AMD K8, K10 and K11 on-die digital thermal sensor

SYNOPSIS

     To compile this driver into the kernel, place the following line in your kernel configuration file:

	   device amdtemp

     Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

	   amdtemp_load="YES"

DESCRIPTION

     The amdtemp driver provides support for the on-die digital thermal sensor present in AMD K8, K10 and K11 processors.

     For the K8 family, the amdtemp driver reports each cores' temperature through a sysctl node in the corresponding CPU devices's sysctl tree,
     named dev.amdtemp.%d.sensor{0,1}.core{0,1}.  The driver also creates dev.cpu.%d.temperature displaying the maximum temperature of the two
     sensors located in each CPU core.

     For the K10 and K11 families, the driver creates dev.cpu.%d.temperature with the temperature of each core.

BUGS

     AMD K9 is not supported because temperature reporting has been replaced by Maltese.

SEE ALSO

     sysctl(8)

HISTORY

     The amdtemp driver first appeared in FreeBSD 7.1.

AUTHORS

     Rui Paulo <rpaulo@FreeBSD.org>
     Norikatsu Shigemura <nork@FreeBSD.org>

BSD
								   April 8, 2008							       BSD
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